这种物质很容易由甲醛和肼反应而得到.The material is readily prepared by reaction of formaldehyde and hydrazine.甲醛能慢慢使多种病毒失去活性.Formaldehyde slowly inactivates many viruses.二氧化硫和甲醛都可产生刺激.Sulfur dioxide and formaldehyde both produce irritati...
评语: 颜色:淡淡的带有微少的柠檬色泽, 且非常透彻明亮.Appearance: Pale in appearance with a slight lemon tinge , yet brilliantly bright.批评,是人们可以用极微少的代价而成为一言重于九鼎之人的一种学问.Criticism is a study by which men grow important and formidable at very small...
the prisoner's repeated denials of the charges against him囚犯再三否认对他的指控The commission's conclusions sweep away a decade of denials and cover-ups.委员会的结论将十年来的否认和掩饰无情地揭开。Despite official denials, the rumours still p...